Max2Play Home 2016 (en) › Forums › Max2Play as Squeezebox (Player / Server) › Correct settings for Max2Play Premium with iquadio DigiAmp+/Amp+ › Reply To: Correct settings for Max2Play Premium with iquadio DigiAmp+/Amp+
Please make sure you have the sound output selection for the Amp+ only selected in one of the players when running them simultaneously. So, if you are using Squeezelite, make sure you do not have Shairport running with the same output.
Also, what output did you get after activating the Amp+? You should have seen three sliders to adjust your volume in the Raspberry Settings.